Nodal analysis with 2 voltage sources

[adashiu]

Can someone solve this circuit

Find v and i in the circuit.

I know that we have to make somethng with supernode, but where the supernode is here? How to develop this problem? Please help me :)

Btw it is nice forum, today i have found that. I hope I will be able to help you in other engeenering topics. Greets

My attempts:

Im not sure, but I think that reference node will be that under 3 ohm resistor ( ? ) I have no idea how to cope with a problem of 2 supernodes in this circuits ( If I am right, that there are 2 supernodes). Actually I am green...

 

[CEL]

You can solve it by using superposition. Substitute one of the sources by a short circuit and solve for the other source. You find i1 and v1.
Then solve for the second source, with the first one short-circuited. You find i2 and v2.
Your solution is i = i1 + i2; v = v1 + v2.